Insulator.



A. J. FOLSTAD.

' INSULATOR.

'APPLICATION FILED MAR. 22. 1915.

' Patented Jan. 25, 1916.

m re

ALMIER J. FOLSTAD, 01E BALATON, MINNESOTA.

INSULATOR,

Specification of Letters Patent. Patented Jan. 25-, 19116.

Application filed March 22, 1915. Serial No. 16,127.

To all whom it may concern:

Be it known that-I, ALMER J; FOLSTAD, a citizen of the United States-residing at Balaton, in the'county of Lyon and State of Minnesota, have invented certain ,new and useful Improvements in Insulators, of which the following is a specification, reference being had to the accompanying draw-' ings.

My present invention relates to new and useful improvements in insulators. of the glass or porcelain type, such as are employed in attaching telegraph or telephone line wire to the cross arm of the pole.

Phe principal object is to provide an insulator of this character which is relatively simple in design, but is so constructed that there will; be little or no possibility of the wire becoming detached, even though the tie .wire employed in securing it to the, insulator, is broken. 7

A further and morespecific object of the invention is to construct an insulator, the body of which is provided with a concaved terminal seatadapted to receive the curved face of the pole, so that when the lag screw employed in attaching theinsulator, is

screwed home.

the body will be held against rotation.

A still further object is to accompany the body of the insulator with a guard hook which extends above the groove in which i the wire normally rests, so that in the event of the contraction of the line wire, as in cold weather, the wire may not become completely' disengaged from the insulator.

The above, and othe'r incidental objects of a similar nature," which will be hereinafter more specifically treated are accomplished by such means as are illustrated in the ac-- cornpanying drawings, described in the following specification, and then more particularly pointed out in. the claims which. are appended hereto and form part of this application. 1

With reference :to the drawings, wherein there-has'beenlillustrated the preferred embodiment'of this invention as it is reduced to practice, and throughout the several views of which similar reference numerals designate corresponding parts, Figure 1 is av longitudinal section taken medially through the insulator, showing the same applied to a view and partly in horizontal section of the insulator applied to the. supporting structure as 1n Fig. 1.

As best disclosed in detail in Fig. 1 of,the

accompanying drawings, the insulator knob or block is formed as a one-piece casting and includes a body portion 10 and a guard hook 11. These two members are preferably formed from porcelain or glass, although some equivalent insulating material may be employed, without departing in any way from the spirit of the invention. The body member 10 tapers toward its outer end and is provided thereat with an annular facial groove-12 which is adapted to receive "the line wire 13 and the tie wire 14. The

inner end of the body member is concaved so that it may seat throughout its entire area against the face'of the pole.

The shank portion 15 of the hook member extends at right angles to the longitudinal axis of the body member, while the bill 16 extends at an acute angle to the shank and toward the body member. The lower face of the bill, indicated at 17 thus'inclines inwardly toward the base end of the body 1 member and at an acute angle to the face of the body member. At thejunction of the bill and shank, and in the inner face of the first ber and is threaded into a post. 'A. washer V of leather, rubber or any other material, indicated at 21 is interposed between the outer end of the body member and the head of the l I lag screw.

It is now to be notedthat when the lag screw has been threaded home to tightly engage the body member against the post, it will be impossible for this member to rotate on the lag screw, because of the conca'ved seat formed at the inner end of the body member. J The tie wire is passed'around the body member, being seated in the groove thereof :and is terminally wound about the line wire,

as indicated at 23. It is to beobserved that even though the tie wire should break and the line wire, as a result of. contraction in cold weather or by reason of difference in V elevation of the next adjacent poles, tend to spring upwardly from the body block, it will be caught within the groove of the pole and thereby held against displacement.

In reduction to practice, it has been found that the form of this invention illustrated in the drawings, and referred to in the above description as the preferred embodiment, is the most efficient and practical; yet realizing that conditions concurrent with the adoption of this device will necessarily vary, it is desirable to emphasize the fact that various minor changes in details of construction, proportion and arrangement of parts may be resorted to, when required, without sacrificing any of the advantages of this invention, as defined in the appended claims.

What is claimed is A 1. An insulator of the character described including a body member having an annular facial groove formed adjacent its outer end, a guard hook formed integrally with the body member and the shank of the hook extendin at right angles to the longitudinal axis of the body member, and a bill extendmeopae ing toward and at an acute angle with respect to the adjacent face of the body member, said shank being disposed on one side of the groove and the bill being extended beyond the other side of the groove.-

2. An insulator of the character described including a body member having an annular facial groove formed adjacent its outer end, a guard hook formed integrally with the body member and the shank of the hook eX- tending' at right angles to the longitudinal aXis of the body member, and a bill extending toward and at an acute angle with respect to the adjacent face of the body member, the inner face of said bill being provided adjacent the junction of the bill and shank with a transverse groove which is transversely alined with the groove of the body member. 7

,In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

' ALMER J. FOLSTAD.

Witnesses: N. C. BERTELSEN,

ALMA MICHAELSONL 

